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plan9: add "nl" command to append a newline to every UDP message (for stuff like |[3]....)

--- a/plan9.c

+++ b/plan9.c

@@ -77,6 +77,7 @@

 static char *ip, *udpport;

 static int udp = -1;

+static int nl = 0;

 static char *midipath;

 static int midi = -1;

@@ -838,7 +839,9 @@

 	} else if (argc > 1) {

 		x = atoi(argv[1]);

-		if (s[0] == 'b' && s[1] == 'p') /* bpm */

+		if (s[0] == 'n' && s[1] == 'l' && s[2] == 0) /* nl */

+			nl = x;

+		else if (s[0] == 'b' && s[1] == 'p') /* bpm */

 			apm = bpm = MAX(1, x);

 		else if (s[0] == 'a' && s[1] == 'p') /* apm */

 			apm = MAX(1, x);

@@ -951,7 +954,13 @@

 		if (t == Oevent_type_udp_string && udp >= 0) {

 			Oevent_udp_string *u = &e->udp_string;

-			write(udp, u->chars, u->count); /* FIXME show errors */

+			if (u->count < sizeof(tmp)-1) {

+				memmove(tmp, u->chars, u->count);

+				if (nl)

+					tmp[u->count++] = '\n';

+				tmp[u->count] = 0;

+				write(udp, tmp, u->count); /* FIXME show errors */

+			}

 			continue;

 		} else if (t == Oevent_type_cmd_string) {

 			Oevent_cmd_string *c = &e->cmd_string;